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Closed-Loop Resonant Density Sensor Design Using Electromagnetic Excitation and Magnetic Detection.

Jingyue Zhang1, Lvjian Li1,2, Jintao Wang1

  • 1National Institute of Metrology, Beijing 100029, China.

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This study presents a novel resonant density sensor using a hyperbolic U-tube. The sensor demonstrates high accuracy and stability for fluid density measurements.

Keywords:
densityelectromagnetic inductionnumerical simulationresonant tubestructural design

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Area of Science:

  • Sensor Technology
  • Materials Science
  • Physics

Background:

  • Resonant sensors offer high sensitivity for physical property measurements.
  • Electromechanical transduction is key for integrated sensor design.
  • Hyperbolic U-tubes provide a unique geometry for resonant sensing.

Purpose of the Study:

  • To develop and analyze a novel resonant density sensor.
  • To investigate the electromechanical transduction principles.
  • To validate the sensor's performance through simulation and measurement.

Main Methods:

  • Utilizing a hyperbolic U-tube as the resonant sensing element.
  • Employing electromagnetic excitation and magnetoelectric detection for transduction.
  • Conducting simulations using ANSYS Electronics and Workbench.
  • Measuring amplitude-frequency characteristics and stability in open-loop and closed-loop modes.

Main Results:

  • Achieved a quality factor greater than 1000 in open-loop mode.
  • Demonstrated measurement stability under various fluid loads.
  • Obtained a sensitivity of approximately -0.1 Hz·kg-1·m3 in closed-loop mode.
  • Reported an absolute error within ±1 kg/m3 for density correction.

Conclusions:

  • The integrated synergistic design of the resonant density sensor is effective.
  • The sensor exhibits high accuracy and stability for real-time density measurement.
  • The employed electromechanical transduction method is suitable for density sensing applications.